ABD: BD^2= AB^2+ AD^2
15^2=12^2+9^2
225=144+81
225= 225
S(ABD)= AB*AD/2= 12*9/2= 6*9= 54
BCD: BD^2= BC^2+ CD^2
(3√61)^2=15^2+18^2
549=225+324
549= 549
ВD и DС - катеты
S(BCD)= 15 *18/2= 15*9= 135
S(ABCD)= 54+135=189 см^2
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ABD: BD^2= AB^2+ AD^2
15^2=12^2+9^2
225=144+81
225= 225
S(ABD)= AB*AD/2= 12*9/2= 6*9= 54
BCD: BD^2= BC^2+ CD^2
(3√61)^2=15^2+18^2
549=225+324
549= 549
ВD и DС - катеты
S(BCD)= 15 *18/2= 15*9= 135
S(ABCD)= 54+135=189 см^2