tlg kasih tau caranya ya

semoga membantu yaaaa

25.
= (phi) × r^2
= (22/7) × 21^2
= 1.386 cm^2
A


26.
= (25×18) + (25×12) + (0,5×10×12)
= 450 + 300 + 60
= 810
C

27.
= 29^2 - 23^2
= 841 - 529
= 312
D

28.
1, 2, 4
B