tolong kerjakan nomor 39&40 plisss.... dikumpulkan besok

39.A=13cm B=16cm
T=10cm
L=1/2*(a+b)*t
=1/2*(13cm+16cm)*10cm
=1/2*29cm*10cm
=A.145cm2

40.d=10cm
Phi=3,14

L=1/4*phi*d2
=1/4*3,14*(10cm)2
=1/4*3,14*100cm2
=B. 78,5cm2