Question

No. 21 donggg...bantu sayaa ^_^

Answer 1

Luas trapesium = 
720                  = 
720                  = 60 x
x                      = 12 cm

CD = 5x = 5 x 12 = 60 cm
AB = 7x = 7 x 12 = 84 cm

BC = √(84-60)² + 10²
      =√ 24² + 10² = 26 cm

Keliling = AD + AB+ CD + BC
            = 10 + 84 + 60 + 26 = 180 cm (A)

Maaf kalau nggak jelas:(

Answer 2

720 = 1/2 x ( 7x + 5x ) x 10 , 720 x 2/1 : 10 = 7x + 5x , 144 = 12x , 144/12 = x , 12 = x , panjang AB = 7.12 = 84 , lebar CD = 5.12 = 60 , sisi miring = 84 - 60 = 24 _ 10~24~… ( triple pythagoras ) = 26 , kell = AB + BC + CD + AD , kell = 84 + 26 + 60 + 10 = 180 cm , jawaban nya A