→Square= a²
→Rectangle=l×b
→Triangle= ½×base×height
→parallelogram= base×height
→circle=Π×r²
→Cylinder= °curved surface area=2Πrh
°Total surface area =2Πrh + 2Πr²
→Rectangular solid= 2(lb+bh+hl)
→cone = Πr²+Πrl , where l=√(r² + h²)
→sphere = 4Πr²
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