1/2*13*11 = 71.5 square cm
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Area of a triangle = 1/2 (Base x Height) Example: Width 13cm, Height 5cm, Base 12cm then; Area=1/2(12cm x 5cm) Area=6cm x 5cm Area=30cm2
A cone with a base of 10cm and a height of 13cm has a volume of 340.34cm3
The formula for area of a triangle is base times height divided by 2, A=BxH/2 So if you're referring to "20 cm and 13 cm" as the base and height, 13x20=260, 260/2=130, so the answer is 130 square cm. :D
Area of a triangle: 0.5*base*perpendicular height
Area = 0.5*Base*Height