Ex 11. What is the formula for the area of a
triangle with base “b” and height “h”?
Ex 12. Find the area of the triangle with sides 3
m, 4 m, and 5 m shown in Ex10 above.
Ex 13. Find the area of this trapezoid. The dotted
lines are perpendicular to the bases.
B. Can you find the area of a circle, given the radius
or diameter. Can you find the area of
a figure whose border contains part of a circle?
Ex 14. What is the formula for the area of a circle
of radius r? Use the approximation π =22/7
to find the area of a circle whose radius is 7 cm.
Ex 15. Find the area of a circle whose diameter is
9.8 cm, accurate to 1 decimal place.
Ex 16. Find the area of the shaded region below,
accurate to one decimal place.
Ex 17. Find the area of the figure below – a
semicircle anchored to 3 sides of a rectangle.
Use a ruler to make any necessary measurements to the nearest 0.1 cm. Round off
the answer to one decimal place.
III. VOLUME. Can you compute the volume of a
rectangular prism, or cylinder, given
Ex 18. Find the volume of a rectangular box that is
8ft. long, 6 ft. wide, and 5 ft. high.
Ex 19. Find the volume of the rectangular prism
Ex 20. Find the volume of the rectangular cylinder
shown below, accurate to one decimal place.
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