Unit 7 Formative 1

Front

What is the formula for the area of a circle?

Back

A = πr², where A is the area and r is the radius.

Front

How do you calculate the area of a trapezoid?

Back

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

Front

What is the value of π (pi) to two decimal places?

Back

π ≈ 3.14.

Front

How do you find the area of a semicircle?

Back

Area = (πr²) / 2, where r is the radius.

Front

What is the formula for the area of a triangle?

Back

Area = (b × h) / 2, where b is the base and h is the height.

Front

What is the height of a trapezoid if the area is known?

Back

Height can be calculated using the formula: h = (2 × Area) / (b₁ + b₂).

Front

What is the area of a circle with a radius of 2 ft?

Back

Area = π(2)² = 12.57 ft².

Front

What is the area of a triangle with a base of 4 mm and a height of 5 mm?

Back

Area = (4 × 5) / 2 = 10 mm².

Front

How do you round a number to the nearest tenths place?

Back

Look at the hundredths place; if it's 5 or more, round up.

Front

What is the area of a circle with a diameter of 10 ft?

Back

Radius = 5 ft; Area = π(5)² = 78.5 ft².