Assignment 4-3: (shorter) Area of trap, circle, and sector

Front

What is the formula for the area of a trapezoid?

Back

Area = (1/2) * (b1 + b2) * h, where b1 and b2 are the lengths of the two bases and h is the height.

Front

How do you calculate the area of a circle?

Back

Area = π * r², where r is the radius of the circle.

Front

What is the relationship between diameter and radius in a circle?

Back

Diameter = 2 * Radius.

Front

If the radius of a circle is 3 cm, what is its area?

Back

Area = π * (3 cm)² = 28.27 cm² (rounded to 2 decimal places).

Front

If the diameter of a circle is 12 cm, what is its area?

Back

Radius = 6 cm; Area = π * (6 cm)² = 113.1 cm² (rounded to 2 decimal places).

Front

What is the formula for the area of a sector of a circle?

Back

Area = (θ/360) * π * r², where θ is the angle in degrees and r is the radius.

Front

What is the area of a shaded region in a geometric figure?

Back

It is the area of the part of the figure that is highlighted or marked, often calculated by subtracting the area of the unshaded part from the total area.

Front

How do you round a number to two decimal places?

Back

Look at the third decimal place; if it is 5 or more, round up the second decimal place by one.

Front

What is the area of a trapezoid with bases of 10 cm and 6 cm, and a height of 4 cm?

Back

Area = (1/2) * (10 cm + 6 cm) * 4 cm = 32 cm².

Front

What is π (pi) approximately equal to?

Back

π is approximately equal to 3.14.