tolong bantu jawab ya yg no 3

a. L = s×s
= 7×7 = 49 cm2
b. D. sisi = √s2+s2
= √7 2 + 7 2 = √49+49
= √98 = 7√2 cm
c. D. ruang = √s2+s2+s2
= √7 2 + 7 2 + 72 = √49+49+49
= √147 = 7√3 cm
d. L = Luas persegi
L = SQ × SQ
L = 7√2 × 7√2
= 49.2 cm2