Jawab ya cuman no 6 sama 7 no kacang ya kak dan pake cara

6. L = p×l
= 45×21cm
= 945cm2
L = phi r 2
= 22/7×10,5cm×10,5cm
= 346,5cm2÷2=173,25cm2
L = A×T÷2
= 21cm×10,5cm÷2
= 110,25cm2
L = 945+173,25+110,25=1228,5cm2