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3060 = 100+ .../2 × t
( sisi satunya tidak dikethui (b) )
2 ) r = 21 m
L O = πr²
= 22/7. 21. 21
= 22. 3. 21 (dpt 3 dari 21 dibagi 3)
= 1386 m²
3 ) L O = 1,54 dm² = 154 cm²
L = πr²
154 = 22/7. r²
7 = 1/7. r² (dapat 7 dr 154 dibagi 22)
7. 7 = r² (dipindah ruas jd perklian)
r² = 49
r = √49
r = 7 cm