How big is my triangle
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How Big Is My Triangle?. Calculating the Area of a Triangle. A triangle is one-half of a parallelogram. The second triangle has been turned upside down. When the second triangle is placed adjacent to the first one, the two triangles form a parallelogram. 1 st triangle. 2 nd triangle.

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How Big Is My Triangle?

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How big is my triangle

How Big Is My Triangle?

Calculating the Area of a Triangle


A triangle is one half of a parallelogram

A triangle is one-half of a parallelogram.

The second triangle has been turned upside down.

When the second triangle is placed adjacent to the first one, the two triangles form a parallelogram.

1st triangle

2nd triangle


You know how to find the area of a parallelogram

You know how to find the area of a parallelogram.

Height (h) = 4 in

Base × Height (b × h) = Area

6 × 4 = 24 square inches

Base (b) = 6 in


How big is my triangle

If a triangle is half of a parallelogram, how do you think you find the area of a triangle?

Multiply base by height (b × h)

Multiply base by height and divide by 2

(b × h) ÷ 2

Multiply base by height and multiply by 2

b × h × 2


So how do you find the base and height of a triangle

So, how do you find the base and height of a triangle?

A right triangle is easy

This isosceles triangle

isn’t too hard

This scalene triangle can be

a little more challenging

height

base

height

base

height

base


How big is my triangle

What is the area of the triangle below?

Use the formula (b × h) ÷ 2

15 square inches

10 square inches

7½ square inches

5 in

3 in


How big is my triangle

Is the area of this triangle 8 square inches?

4 inches

4 inches


How big is my triangle

Draw lines to show where you could measure the base and height of this triangle.


How big is my triangle

If this triangle has the specified base and height, what is its area?

21 square inches

42 square inches

13½ squareinches

6 in

7 in


How big is my triangle

Draw lines to show where you could measure the base and height of this triangle.


How big is my triangle

If this triangle has the specified base and height, what is its area?

4½ square inches

18 square inches

9 square inches

9 in

2 in


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