Geometry and Coordinate Concepts

The video tutorial covers various geometry topics, including calculating the perimeter of equilateral triangles, finding the circumference and radius of circles, understanding triangle and quadrilateral similarity, and graphing points on a coordinate grid. It emphasizes the importance of recognizing equal sides in shapes and using multiplication to maintain similarity in geometric figures.

What is the perimeter of an equilateral triangle with each side measuring 20 cm?

• 40 cm

• 100 cm

• 60 cm

• 80 cm

If the perimeter of two equilateral triangles is 80 cm, what is the length of one side of one triangle?

• 10 cm

• 20 cm

• 30 cm

• 40 cm

What is the perimeter of an equilateral triangle with a side length of 10 cm?

• 20 cm

• 30 cm

• 40 cm

• 50 cm

What is the perimeter of an equilateral triangle with a side length of 15 cm?

• 30 cm

• 75 cm

• 45 cm

• 60 cm

What is the formula for the circumference of a circle?

• r²

• πd

• 2πr

• πr²

Given a circle with a radius of 8 cm, what is its approximate circumference?

• 60 cm

• 40 cm

• 25 cm

• 50 cm

If the radius of a circle is doubled, what happens to the circumference?

• It quadruples

• It triples

• It doubles

• It remains the same

If the radius of a circle is tripled, what happens to the circumference?

• It remains the same

• It doubles

• It increases ninefold

• It triples

If the diameter of a circle is 112 inches, what is the radius?

• 84 inches

• 28 inches

• 112 inches

• 56 inches

How do you calculate the radius from the diameter?

• Add 2

• Subtract 2

• Divide by 2

• Multiply by 2