Area of Triangles | Kadian Jackson - Free Printable

Let’s solve each triangle one by one using the formula:
Area = ½ × base × height

We must be careful to pick the correct base and the corresponding height — the height is always the perpendicular distance from the base to the opposite corner.

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Triangle 1:

It’s a right triangle (you can tell because two sides are at a right angle).
Base = 8 cm, Height = 6 cm
(You could also use 6 cm as base and 8 cm as height — same result.)

Area = ½ × 8 × 6
= 4 × 6
= 24 cm²

✔ Check: ½ × 8 × 6 = 24 → Correct.

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Triangle 2:

This is an isosceles triangle with a vertical height drawn inside.
Base = 10 m, Height = 12 m (the black line going straight down)

Area = ½ × 10 × 12
= 5 × 12
= 60 m²

✔ Check: ½ × 10 × 12 = 60 → Correct.

Note: The 13 m sides are slant heights — we don’t use them for area unless we’re doing something else. We only need base and perpendicular height.

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Triangle 3:

The base is given as 10 m.
The height is shown as a dashed line going up to the top vertex — it’s labeled 6 m.
Even though the triangle looks “tilted”, the height is still perpendicular to the base.

Area = ½ × 10 × 6
= 5 × 6
= 30 m²

✔ Check: ½ × 10 × 6 = 30 → Correct.

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Triangle 4:

Here, the base is 25 cm.
The height is the dashed line inside the triangle — it’s labeled 20 cm.
(The 24 cm side is just another side — not needed for area.)

Area = ½ × 25 × 20
First, ½ × 20 = 10
Then, 10 × 25 = 250 cm²

✔ Check: ½ × 25 × 20 = 250 → Correct.

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Final Answer:
1. 24
2. 60
3. 30
4. 250