Triangles
Find the area of a triangle with base = 0.05 m and height = 6 cm. Give your answer in cm
15 cm²
A rectangle has a length of 12 cm and a width of 5 cm.
Find its area.
60 cm²
A trapezoid has bases of 8 cm and 6 cm, and a height of 4 cm.
Find its area.
28 cm²
Find the area of a circle with a radius of 7 cm.
154 cm²
Find the circumference of a circle with a radius of 7 cm.
44 cm
A triangle has an area of 24 cm² and height = 0.06m. Find the base.
8 cm
A parallelogram has an area of 120 cm² base of 15 cm.
Find its height.
8 cm
The area of a trapezoid is 45 cm². Its bases are 10 cm and 8 cm.
Find its height.
5 cm
Find the area of a semicircle with a radius of 14 cm.
308 cm² or 307.72 cm²
Find the circumference of a circle with a diameter of 1000 cm. Give your answer in m
31.4 cm
A triangle has a base of 15 cm and height of 10 cm.
If both the base and height are doubled, what happens to the area?
The area becomes 4 times larger.
The area of a square is 81 m².
Find its side length and perimeter.
36 m
A trapezoid has an area of 60 cm², a height of 5 cm, and one base is 8 cm.
Find the other base.
16 cm
The area of a semicircle is 77 cm².
Find the radius (use π = 3.14).
7 cm
How many radii form the boundaries of a quarter circle?
2
A triangle has a height of 8 cm. Its base is 3 cm more than the height.
Find the area of the triangle.
44 cm²
A trapezoid has bases of 10 cm and 0.18 m, and an area of 84 cm².
Find its height.
6 cm
The height of a trapezoid is 10 cm, and its area is 75 cm².
If one base is 12 cm, find the other base.
3 cm
If the radius of a circle is doubled, how many times larger does the area become?
r² → (2r)² = 4r² → 4 times larger
The circumference of a circle is 44 cm.
Find its area (use π = 22/7).
154 cm²
The area of a triangle is 72 cm². The base is four times the height.
Find the base and the height.
Height = 6 cm
Base = 24 cm
A parallelogram and a rectangle have the same base (10 cm) and the same area (80 cm²).
The height of the parallelogram is 8 cm.
Find the height of the rectangle and explain what this tells us about their shapes.
Height of rectangle = 8 cm
Observation: Both shapes have the same area because their base and height are the same, even though the parallelogram slants.
A trapezoid has an area of 84 cm² and bases of 9 cm and 15 cm.
If the height is increased by 2 cm, what will the new area be?
108 cm²
A semicircular garden has the same area as a square with a side of 14 m.
Find the radius of the semicircle (use π = 22/7).
r ≈ 11.2 m
Find the perimeter of a semicircle with a radius of 14 cm.
72 cm