- Free Printable
Educational worksheet: . Download and print for classroom or home learning activities.
JPG
271×350
57.5 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #235172
⭐
Show Answer Key & Explanations
Step-by-step solution for:
▼
Show Answer Key & Explanations
Step-by-step solution for:
Let’s solve each proof step by step. We’ll use the given information and geometry rules to prove what’s asked.
---
Proof #1:
Given:
- E is the midpoint of AC → So AE = EC
- E is the midpoint of BD → So BE = ED
We need to prove: △AEB ≅ △CED
Step-by-step reasoning:
1. Since E is the midpoint of AC, then AE ≅ EC (by definition of midpoint).
2. Since E is the midpoint of BD, then BE ≅ ED (also by definition of midpoint).
3. Look at angles ∠AEB and ∠CED — they are vertical angles (formed where two lines cross). Vertical angles are always congruent → ∠AEB ≅ ∠CED.
4. Now we have:
- Side AE ≅ side EC
- Angle ∠AEB angle ∠CED
- Side BE ≅ side ED
5. That’s Side-Angle-Side (SAS) congruence! Two sides and the included angle match.
✔ So, △AEB ≅ △CED by SAS.
---
Proof #2:
Given:
- I is on JH̄
- K is the midpoint of IJ̄ → so IK = KJ
- L is the midpoint of IH̄ → so IL = LH
We need to prove: JK̄ ≅ HL̄
Step-by-step reasoning:
1. K is midpoint of IJ̄ → IK ≅ KJ → so JK = ½ IJ
2. L is midpoint of IH̄ → IL ≅ LH → so HL = ½ IH
3. But wait — we don’t know if IJ = IH. However, look again: The diagram shows points J-I-H in a line? Actually, from the figure, it seems J, I, H are colinear with I between J and H? Not necessarily stated.
Wait — let’s reread: “I is on JH̄” → that means point I lies somewhere on segment JH. So J—I—H are in a straight line, with I between J and H.
So JH is one big segment, and I is somewhere on it.
Then:
- K is midpoint of IJ → so JK = KI = ½ IJ
- L is midpoint of IH → so IL = LH = ½ IH
But we want to prove JK ≅ HL.
That would only be true if IJ = IH — which isn’t given.
Wait — maybe there’s a typo or misread? Let me check the original problem again.
Actually, looking back: In Proof #2, the goal is to prove JK̄ ≅ HL̄
But unless IJ = IH, this won’t hold. Unless... perhaps the diagram implies symmetry? Or maybe we’re supposed to assume something else?
Wait — no, actually, let’s think differently.
Maybe the key is that both JK and HL are halves of segments that together make up JH? But still, without knowing how I divides JH, we can’t say JK = HL.
Hold on — perhaps I misread the givens.
Original says:
> Given: I is on JH̄, K is the midpoint of IJ̄, L is the midpoint of IH̄
> Prove: JK̄ ≅ HL̄
This is only true if IJ = IH — i.e., if I is the midpoint
---
Proof #1:
Given:
- E is the midpoint of AC → So AE = EC
- E is the midpoint of BD → So BE = ED
We need to prove: △AEB ≅ △CED
Step-by-step reasoning:
1. Since E is the midpoint of AC, then AE ≅ EC (by definition of midpoint).
2. Since E is the midpoint of BD, then BE ≅ ED (also by definition of midpoint).
3. Look at angles ∠AEB and ∠CED — they are vertical angles (formed where two lines cross). Vertical angles are always congruent → ∠AEB ≅ ∠CED.
4. Now we have:
- Side AE ≅ side EC
- Angle ∠AEB angle ∠CED
- Side BE ≅ side ED
5. That’s Side-Angle-Side (SAS) congruence! Two sides and the included angle match.
✔ So, △AEB ≅ △CED by SAS.
---
Proof #2:
Given:
- I is on JH̄
- K is the midpoint of IJ̄ → so IK = KJ
- L is the midpoint of IH̄ → so IL = LH
We need to prove: JK̄ ≅ HL̄
Step-by-step reasoning:
1. K is midpoint of IJ̄ → IK ≅ KJ → so JK = ½ IJ
2. L is midpoint of IH̄ → IL ≅ LH → so HL = ½ IH
3. But wait — we don’t know if IJ = IH. However, look again: The diagram shows points J-I-H in a line? Actually, from the figure, it seems J, I, H are colinear with I between J and H? Not necessarily stated.
Wait — let’s reread: “I is on JH̄” → that means point I lies somewhere on segment JH. So J—I—H are in a straight line, with I between J and H.
So JH is one big segment, and I is somewhere on it.
Then:
- K is midpoint of IJ → so JK = KI = ½ IJ
- L is midpoint of IH → so IL = LH = ½ IH
But we want to prove JK ≅ HL.
That would only be true if IJ = IH — which isn’t given.
Wait — maybe there’s a typo or misread? Let me check the original problem again.
Actually, looking back: In Proof #2, the goal is to prove JK̄ ≅ HL̄
But unless IJ = IH, this won’t hold. Unless... perhaps the diagram implies symmetry? Or maybe we’re supposed to assume something else?
Wait — no, actually, let’s think differently.
Maybe the key is that both JK and HL are halves of segments that together make up JH? But still, without knowing how I divides JH, we can’t say JK = HL.
Hold on — perhaps I misread the givens.
Original says:
> Given: I is on JH̄, K is the midpoint of IJ̄, L is the midpoint of IH̄
> Prove: JK̄ ≅ HL̄
This is only true if IJ = IH — i.e., if I is the midpoint
Parent Tip: Review the logic above to help your child master the concept of geometry proof worksheets with answers.