A plane figure with three straight sides and three angles.
Half perimeter P = (A + B + C) / 2
Length A = 10 m, Length B = 10 m
Length C = 10 m, Area (A) = ?
P = ( 10 + 10 + 10 ) / 2 = 15
Area (A) = √(P *( P-A )*( P-B )*( P-C ))
Area (A) = √(15 *( 15-10 )*( 15-10 )*(15-10 ))
Area (A) = √1875
Area (A) = 43.3013 m2