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# Lesson 9 Review

### Review of Information Needed to Complete Lesson 9 of Math III Unit 4

What are you finding when you use the following formula: A=1/2 bh? Area of a Triangle
What formula is used to find the area of a rectangle? A = LW (Area equals length times width)
What is the formula for finding the area of a circle? A=pi(r^2) (Area equals pi times the square of the radius)
Define circumference. The circumference of a circle is the distance around the circle.
When do you use the following formula: C=2(pi)r? Circumference of a Circle
Define arc length. The distance along the arc (part of the circumference of a circle, or any curve).
How is arc length calculated? Arc Length = θ × r (when θ is in radians) Arc Length = (θ × π/180) × r (when θ is in degrees)
What is a central angle? A central angle is formed by two radii that start at the center and intersect the circle itself.
When is the Pythagorean Theorem used? The Pythagorean Theorem is used when working with a right triangle.
What is a net? A geometry net is a 2-dimensional shape that can be folded to form a 3-dimensional shape. Also, a net may be defined as a pattern made when the surface of a three-dimensional figure is laid out flat showing each face of the figure.
Created by: Jeanievictory