Transcript Glencoe Mathematics

Five-Minute Check (over Lesson 10–3)
Main Idea
Key Concept: Area of a Triangle
Example 1: Find the Area of a Triangle
Example 2: Find the Area of a Triangle
Example 3: Use Area to Solve a Problem
• Find the areas of triangles.
Interactive Lab:
Area of Triangles
Find the Area of a Triangle
Find the area of the triangle.
By counting, you find that the measure
of the base is 5 units and the height is
8 units.
Find the Area of a Triangle
Multiply.
Multiply.
Answer: The area of the triangle is 20 square units.
Find the area of the triangle.
A. 9 units2
B. 15 units2
C. 18 units2
D. 36 units
2
0%
0%
A
B
0%
C
0%
D
1.
2.
3.
4.
A
B
C
D
Find the Area of a Triangle
Find the area of the triangle.
16 cm
8 cm
Find the Area of a Triangle
Multiply.
A = 64
Multiply.
Answer: The area of the triangle is 64 square
centimeters.
Find the area of the triangle.
A. 4.5 in2
B. 7.5 in2
C. 8 in2
0%
0%
D
0%
C
A
0%
B
D. 12 in2
1.
2.
3.
4.
A
B
C
D
Use Area to Solve a Problem
BANNER Ari cut out a banner in
the shape of a triangle. What is
the area of the banner?
Multiply.
A = 36
Multiply.
Answer: The area of the banner is 36 square inches.
Rachael decides to purchase a triangular
pennant to hang on her bedroom wall as a
souvenir of the baseball game she attended.
If the base of the pennant is 9 inches and
the height is 25 inches, how many square
inches of her wall will be covered by the
pennant? Round to the nearest tenth.
A. 98.25 in2
B. 25 in
1.
2.
3.
4.
2
C. 112.5 in2
0%
D
0%
C
0%
B
A
D. 225 in
0%
2
A
B
C
D
End of the Lesson
Five-Minute Check (over Lesson 10–3)
Image Bank
Math Tools
Using a Net to Build a Cube
Area of Triangles
(over Lesson 10-3)
Find the area of the
parallelogram.
A. 32 cm2
B. 64 cm2
C. 120 cm
D. 240 cm
2
2
0%
0%
A
B
0%
C
0%
D
1.
2.
3.
4.
A
B
C
D
(over Lesson 10-3)
Find the area of the
parallelogram.
A. 24 in2
B. 48 in2
0%
0%
D
0%
C
D. 270 in2
A
0%
B
C. 135 in
2
1.
2.
3.
4.
A
B
C
D
(over Lesson 10-3)
Find the area of the
parallelogram.
A. 26 m2
B. 52 m2
0%
0%
D
0%
C
D. 120 m2
A
0%
B
C. 60 m
1.
2.
3.
4.
2
A
B
C
D
(over Lesson 10-3)
Find the area of the
parallelogram.
A. 450 ft2
B. 225 ft2
0%
0%
D
0%
C
D. 45 ft2
A
0%
B
C. 90 ft
1.
2.
3.
4.
2
A
B
C
D
(over Lesson 10-3)
Estimate the area of a parallelogram with base
5.25 yards and height 2.7 yards.
A. 15 yd2
B. 13 yd2
C. 7 yd2
D. 6 yd2
0%
0%
A
B
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2.
3.
4.
0%
C
A
B
C
D
0%
D
(over Lesson 10-3)
What is the area of parallelogram-shaped patio that
has a height of 10 m and a width of 6 m?
A. 30 m2
B. 50 m2
C. 60 m2
D. 120 m2
0%
0%
A
B
1.
2.
3.
4.
0%
C
A
B
C
D
0%
D