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Multiplication Worksheets - Page 3

Multiplication Worksheets
  • Page 3
 21.  
The height of the triangle is 10 times the base b in a right triangle. Find the area of the triangle.
a.
5b square units
b.
15b2 square units
c.
10b2 square units
d.
5b2 square units


Solution:

Height of the triangle is 10b units.

Area of a triangle = 1 / 2 x base x height
[Write the formula.]

= 12 × b × 10b
[Substitute the values.]

= 5b2
[Simplify.]

Area of the right triangle is 5b2 square units.


Correct answer : (4)
 22.  
Find the area of the rectangle.

a.
(y2 - 4y) square units
b.
(4y2 - 4y) square units
c.
(y2 - 4) square units
d.
(4y2 - y) square units


Solution:

2y and (2y - 2) are the sides of the rectangle.

Area of the rectangle = Length x Width
[Write the formula.]

= 2y(2y - 2)
[Substitute the values.]

= 2y(2y) - 2(2y)
[Use distributive property.]

= 4y2 - 4y
[Multiply.]

Area of the rectangle is (4y2 - 4y) square units.


Correct answer : (2)

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