tolong jawab no 4 dan 5 beserta cara nya

4) Bangun datar = 1/4 lingkaran × 2 + layang-layang
     Luas 1/4 lingkaran × 2 = (π × r² × 1/4) ×2
                                            = (3,14 × 10² × 1/4) ×2
                                            = (3,14 × 100 ÷ 4)   ×2
                                            = (    314         ÷ 4)   ×2
                                            =       78,5 cm²         ×2
                                            =            157 cm²
     Luas layang-layang = (d1 × d2) ÷ 2
                                       = ((6+15) × (8×2))   ÷ 2
                                       = ( 21 cm × 10 cm) ÷ 2
                                       =        210 cm²         ÷ 2
                                       =               105 cm²
    Luas bangun datar = L.1/4 lingkaran×2 + L.layang-layang
                                     =          157 cm²        +      105 cm²
                                     =                          262 cm²
5) Volume bangun ruang = V.1/2 tabung + V.balok
     Volume 1/2 tabung = 1/2 × (π × r² × t)
                                      = 1/2 × (22/7 × (70÷2)² × 100)
                                      = 1/2 × (22/7 ×   35²      × 100)
                                      = 1/2 × (22/7 × 35 × 35 × 100)
                                      = 1/2 × (22    ×  5   × 35 × 100)
                                      = 1/2 × (    110        ×    3500   )
                                      = 1/2 ×          385.000 m³
                                      =        192.500 m³
    Volume balok = p × l × t
                            = 100m × 70m × 20m
                            =        140.000 m³
    Volume bangun ruang = V.1/2 tabung + V.balok
                                           = 192.500 m³  + 140.000 m³
                                           =            332.500 m³