What is the formula of frustum(tsa) how we get it

1.	What is the formula of frustum(tsa) how we get it
Answer» Piel(r1+r2) + pie(r1square + r2square) Csa of frustum=πl(R1+R2)In tsa area of two more circles is added im csaFirst radius is taken as r1 and second as r2Area of circle=πr²So,TSA=πl(r1+r2)+πr1²+πr2²Hope u will understand

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