Let's solve each of these
Pythagorean Theorem word problems step by step. The Pythagorean Theorem states:
$$
a^2 + b^2 = c^2
$$
where $ a $ and $ b $ are the legs of a right triangle, and $ c $ is the hypotenuse (the longest side, opposite the right angle).
---
1) Dan secures a ladder firmly to the wall...
- The foot of the ladder is 6 feet from the wall.
- The top of the ladder rests 8 feet up the wall.
- We need to find the length of the ladder (hypotenuse).
This forms a right triangle:
- $ a = 6 $ ft (horizontal leg)
- $ b = 8 $ ft (vertical leg)
- $ c = ? $ (ladder length)
$$
c^2 = 6^2 + 8^2 = 36 + 64 = 100
$$
$$
c = \sqrt{100} = 10
$$
✔ Answer: 10.0 feet
---
2) Diagonal of a square carom board with side 28 inches
- A square has equal sides.
- The diagonal splits the square into two right triangles.
- So, use Pythagorean Theorem:
- $ a = 28 $
- $ b = 28 $
- $ c = ? $
$$
c^2 = 28^2 + 28^2 = 784 + 784 = 1568
$$
$$
c = \sqrt{1568} \approx 39.6
$$
✔ Answer: 39.6 inches
---
3) Carlos flies his drone 5 feet above ground, then rotates it 12 feet to the right
- The drone starts at a point, goes
up 5 feet, then
moves horizontally 12 feet.
- This forms a right triangle:
- Vertical leg: 5 ft
- Horizontal leg: 12 ft
- Hypotenuse: distance from start point
$$
c^2 = 5^2 + 12^2 = 25 + 144 = 169
$$
$$
c = \sqrt{169} = 13
$$
✔ Answer: 13.0 feet
---
4) Ship travels 9 miles north, then 20 miles west. Find shortest route back
- The ship’s path forms a right triangle:
- North: 9 miles (one leg)
- West: 20 miles (other leg)
- Shortest route = straight line (hypotenuse)
$$
c^2 = 9^2 + 20^2 = 81 + 400 = 481
$$
$$
c = \sqrt{481} \approx 21.9
$$
✔ Answer: 21.9 miles
---
5) Dahlia cuts fabric in shape of right triangle. Longest side is 8 inches, one other side is 4 inches. Find the third side
- Longest side = hypotenuse = 8 inches
- One leg = 4 inches
- Find the other leg.
Let $ a = 4 $, $ c = 8 $, $ b = ? $
$$
a^2 + b^2 = c^2
$$
$$
4^2 + b^2 = 8^2
$$
$$
16 + b^2 = 64
$$
$$
b^2 = 64 - 16 = 48
$$
$$
b = \sqrt{48} \approx 6.9
$$
✔ Answer: 6.9 inches
---
✔ Final Answers (Rounded to Nearest Tenth):
1)
10.0 feet
2)
39.6 inches
3)
13.0 feet
4)
21.9 miles
5)
6.9 inches
Let me know if you'd like a diagram or explanation for any!
Parent Tip: Review the logic above to help your child master the concept of pythagorean theorem worksheet grade 8.
