Essential Understanding You can use trigonometry to find the area of a regular polygon You can use trig to find the area of a triangle when you know the length of two sides and the included angle. Students will be able to find areas of regular polygons and triangles using trigonometry.
What is the area of a regular pentagon with 4in sides? Round your answer to the nearest square in. A tabletop has the shape of a regular decagon with a radius of 9.5 in. What is the area of the tabletop to the nearest square inch?
Finding Area Suppose you want to find the area of a triangle. What formula could you come up with to find the area of any triangle using a trig function sinA = h/c h = csinA A = ½(bc)sinA