Page 140 - NUMINO TG_5A

08Find Areas of Triangles Unit

154-B4-1 154-B4-2

Areas of Triangles (2) 2. Write the missing numbers.
1. Find the area of each triangle.

Example height Base: 4 cm Example Since the area of the triangle is
base Height: 4 cm 6 cm 6 2 21 cm2,
Area 4 4 2 8 cm2
the base length is 7 cm.

cm

a. b.

a. b.

cm2 cm2 cm cm
c. d.
8 cm 9 cm
cm2 cm2 Area: 24 cm2 Area: 36 cm2
e. f. c. d.

5 cm 6 cm

cm2 cm2 cm cm
Area: 20 cm2 Area: 15 cm2

Objective Use a formula to find the area of a Objective Find the base or height when there
triangle. is a given area.

Textbook Reference Activity 1 Textbook Reference Activity 1

154-B5-1 154-B5-2

Areas of Triangles (3) cm2 2. Write a number sentence to solve the problem.
1. Answer each question. cm2
cm2 a. The height of a triangle is twice as long as the base. If the length of the base
Example is 5 cm, what is the area of the triangle?
Find the area of the button below.

6 cm Sentence:
Area:
cm2

10 cm

Sentence: Answer :
Answer:
a. Find the area of the bread below. Answer: b. The base of a triangle is the same as the height. If the height is 8 cm, what is
the area of the triangle?

8 cm Sentence:
Area:
6 cm cm2

Sentence:

b. Find the area of the road sign below. c. The area of a triangle is 27 cm2. If the base is 6 cm, what is the height?
Sentence:
52 cm STOP
60 cm

Sentence: Height: cm

Objective Solve application problems with the Objective Solve application problems with the
area of triangles. area of triangles.

Textbook Reference Activity 1 Textbook Reference Activity 1

5A Unit 08 123