Bellwork Add the special formula for the equilateral triangle below to your toolbox. Find the area of an equilateral triangle with a side of.

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Presentation transcript:

Bellwork Add the special formula for the equilateral triangle below to your toolbox. Find the area of an equilateral triangle with a side of.

Extra Credit Using the formula for a regular polygon and given that a side of an equilateral triangle is “s”, find the formula for the area of an equilateral triangle.

Example 1 Find the apothem, perimeter and area of a regular nonagon with radius 5 ft to the nearest tenth.

Example 2 Find the apothem, radius and area of a regular pentagon with perimeter 60 cm to the nearest tenth.

Example 3 Find the area, perimeter and radius of a regular octagon with apothem 4 inches to the nearest tenth.

Homework 534 # 12, 14, 17 (a & c only) and worksheet Quiz NEXT Friday over

Bellwork w/partner ACT ABFG is a rectangle, BCDF is a square, BC = 6 inches, and E is the midpoint of. The length of is twice the length of. What is the area of trapezoid ABEG?

Extra Credit Using the formula for a regular polygon and given that a side of an equilateral triangle is “s”, find the formula for the area of an equilateral triangle.

Extra Credit Using the formula for a regular polygon and given that a side of an equilateral triangle is “s”, find the formula for the area of an equilateral triangle.

Extra Credit Using the formula for a regular polygon and given that a side of an equilateral triangle is “s”, find the formula for the area of an equilateral triangle.

Extra Credit Using the formula for a regular polygon and given that a side of an equilateral triangle is “s”, find the formula for the area of an equilateral triangle.

Extra Credit Using the formula for a regular polygon and given that a side of an equilateral triangle is “s”, find the formula for the area of an equilateral triangle.

Extra Credit Using the formula for a regular polygon and given that a side of an equilateral triangle is “s”, find the formula for the area of an equilateral triangle.