1. Finding the Area of Triangles
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2. Warm Up c A = 1638in2 Find the area. 54.6in 2). 1). 30 in A = 7x + 21
A = 1638in2
Find the area.
54.6in
2).
1).
30 in
A = 7x + 21
2x +2
3).
4).
x + 3 5 7
A = 10x + 10
4x +14
7x+21

3. Finding the Area of Triangles

4. To find the area of a triangle you multiply the base and the height and divide by 2.h b

5. Example 1: Find the area of the triangle.
A = (6cm)(8cm) ÷ 2
A = 24cm2
8cm
6cm

6. Example 2: Find the area of the triangle.
A = (12in)(8in) ÷ 2
A = 48in2
8in
12in

7. Example 3: Find the area of the triangle.
A = (6x)(4) ÷ 2
A = 24x ÷ 2 4
A = 12x 6x

8. Practice Find the area. 1. 2. 3. 125cm2 20cm2 300cm2 125cm2 10cm 20cm2

9. Closure
If the area of a triangle is 36m2 and the height of the triangle is 8m, what is the base of the triangle? 9m