Unit 3 - Triangles (REVIEW)

Front

What is an obtuse isosceles triangle?

Back

An obtuse isosceles triangle is a triangle that has one angle greater than 90 degrees (obtuse) and two sides of equal length.

Front

How do you find the length of the diagonal in a rectangle?

Back

Use the Pythagorean theorem: If a rectangle has length 'l' and width 'w', the diagonal 'd' is given by d = √(l² + w²).

Front

What is the measure of angle D if the triangle has angles 40 degrees and 140 degrees?

Back

Angle D is 40 degrees.

Front

What are the side lengths of a right triangle?

Back

A right triangle has side lengths that satisfy the Pythagorean theorem: a² + b² = c², where c is the hypotenuse.

Front

Does the set of numbers 20, 25, 15 represent a right triangle?

Back

Yes, because 20² + 15² = 25².

Front

What is the Pythagorean theorem?

Back

The Pythagorean theorem states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

What is the formula for the area of a triangle?

Back

The area of a triangle is given by the formula: Area = 1/2 * base * height.

Front

What is the sum of the interior angles of a triangle?

Back

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

Front

How can you determine if a triangle is obtuse?

Back

A triangle is obtuse if one of its angles measures greater than 90 degrees.