Luas bangun segitiga disamping 616cm2. Berapa keliling bangun tersebut?

Luas lingkaran = pi . r²
616 cm² = 22/7 x r²
r² = 616 cm² : 22/7
r² = 616 cm² x 7/22
r² = 196 cm
r = √196 cm
r = 14 cm

Keliling lingkaran = 2 . pi . r
= 2 x 22/7 x 14
= 44/1 x 2
= 88 cm

LUAS LINGKARAN : PHI X R X R
                    616 CM2 = 22/7
                               = 616 ; 22/7
                               = 616 X  7/22
                               = 196 CM
                               = [tex] \sqrt{ 196[/tex]
                               = 14 CM
SEMOGA MEMBANTU