Math 7/8 Semester 1 Review

Front

What is the formula to find the circumference of a circle?

Back

C = πd, where C is the circumference and d is the diameter.

Front

If a circle has a circumference of 40π inches, what is its diameter?

Back

40 inches.

Front

What is the constant of proportionality in a proportional relationship?

Back

It is the ratio that relates two quantities, often represented as k in the equation y = kx.

Front

How do you calculate the percent of change?

Back

Percent of change = (New Value - Old Value) / Old Value × 100%.

Front

If 72 people got a speeding ticket one week and 36 the next, what is the percent of change?

Back

Decrease 50%.

Front

What does it mean for two figures to be similar?

Back

Two figures are similar if they have the same shape but not necessarily the same size, and their corresponding angles are equal.

Front

How do you simplify the expression 3a + 2b + 5a?

Back

8a + 2b.

Front

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

Back

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

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (d = 2r).

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.