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
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30 sq cm ((12 x 5)/2)
1/2*13*11 = 71.5 square cm
Area = pi*132 = 530.9291585 or 531 square cm
750 sq cm
29cm times 13cm= 377cm squared :)