7th Grade Math STAAR Prep

Front

What is the relationship between the height of an object and the length of its shadow?

Back

The height of an object and the length of its shadow are proportional. If two objects cast shadows, the ratio of their heights is equal to the ratio of their shadow lengths.

Front

How do you find the height of an object using similar triangles?

Back

To find the height of an object using similar triangles, set up a proportion using the heights and shadow lengths of the objects. For example, if a building's height and shadow length are known, and the shadow length of a person is known, you can find the person's height.

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

How do you solve for an unknown angle in a triangle?

Back

To solve for an unknown angle in a triangle, subtract the sum of the known angles from 180 degrees.

Front

What is probability?

Back

Probability is a measure of the likelihood that an event will occur, expressed as a ratio of the number of favorable outcomes to the total number of possible outcomes.

Front

How do you calculate the probability of two independent events occurring in sequence?

Back

To calculate the probability of two independent events occurring in sequence, multiply the probability of the first event by the probability of the second event.

Front

What is the formula for the circumference of a circle?

Back

The formula for the circumference of a circle is C = 2πr, where r is the radius.

Front

How do you calculate the circumference of a circle with a given radius?

Back

To calculate the circumference, use the formula C = 2πr. For a radius of 16 feet, C = 2π(16) ≈ 100.48 feet.

Front

What is an inequality?

Back

An inequality is a mathematical statement that compares two expressions, showing that one is greater than, less than, or not equal to the other.

Front

How do you solve a linear inequality?

Back

To solve a linear inequality, isolate the variable on one side of the inequality sign, similar to solving an equation, while remembering to reverse the inequality sign if you multiply or divide by a negative number.