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= 22/7 × 70
= 220 cm
2) L lngkrn = pi × r²
= 22/7 × 35 × 35
= 3850 cm²
3) d = √p²-(R+r)²
4) p = √l²+(R-r)²
ket : d = grs prsktn dlm ,, l = grs prsktn luar ,, p = jrk psat