A regular hexagonal mirror has a side of 18 cm. If 12% of the mirror area is covered by the frame, what is the visible glass area?
740.7 cm^2
Area of a regular hexagon = (3 x sqrt(3)/2) x s^2 = (3 x 1.732/2) x 324 = 841.78 sq cm. Visible area = 88% of total = 0.88 x 841.78, approximately 740.7 sq cm.
Calculate the area of the triangle whose sides are 8 cm, 9 cm and 13 cm. (Rounded up to two decimal places)