Soal no. 34, 12, dan 11

Soal no. 34:

Luas sisi kubus   = 6 x s x s

216                         = 6 x s²

s²                            = 216 : 6

s²                            = 36

s                              = √36

s                              = 6 cm

Volume kubus   = s x s x s

                                = 6 x 6 x 6

                                = 216 cm³

Jadi volume kubus adalah 216 cm³

Soal no. 12:

pRTS         = ½ (pPOQ - pROS )

                   = ½ (120^o – 30^o)

                   = ½ x 90^o

                   = 45^o

Soal no. 11:

pAED        = ½ (pAOD + pBOC)

                   = ½ (120^o + 50^o)

                   = ½ (170^o)

                   = 85^o

pAEC adalah pelurus pAED, sehingga pAED = 180^o – 85^o = 95^o.