Page 77 - TB_5B

Challenge Application Problems

1 . The first problem has already been solved. Use the method shown

below to solve other problems.

a. Point D is at 1 of AC. Area of triangle
4 Height

Find the area of the colored triangle.

A

4 cm Base
Area of triangle
D
base height
B 6.4 cm C 1
2

Explanation: 1 of the
The area of the colored triangle is 4

area of the whole triangle.

ABC 6.4 4 2 12.8
BCD 12.8 4 3.2

Answer: 3.2 cm2

b. Point D is at 1 of AB. Explanation:
3

Find the area of the colored triangle.

A
D

5 cm

B 4.8 cm C

Answer:

66