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3) L = L 1/2 lingkaran besar + Luas persegi panjang -luas 1/4 lingkaran kecil
L = 1/2×phi×r^2 + p×l - 1/4×phi×r^2
L = 1/2×phi×7×7 + 14×10 -1/4×phi×4×4
L = 1/2×22/7×49 + 140 - 1/4×3,14×16
L = 11×7 + 140 - 3,14×4
L = 77 +140 - 12,56
L = 217 -12,56
L = 204,44 cm^2

4)L = Luas Juring - Luas Segitiga
L = 90/360 × 22/7 ×14×14 - 1/2 14×14
L = 1/4×22×2×14 - 7×14
L = 11×14 -7×14
L = 154 - 98
L = 56 cm^2

5) r = Lsegitiga/ 1/2 keliling segitiga
r = (1/2 ×20×15) / ( 1/2× (15+20+25))
r = (20×15) / (60)
r= 300/60
r = 5 cm

L = phi r^2
L= 3,14×5×5
L = 78,5 cm^2