Step 3: Calculatea
acan be calculated using the theorem of Pythagoras:
a=√
r^2 +h^2Step 4: Calculate the area of the circular base (Ab)
Ab=r^2Step 5: Calculate the area of the curved walls (Aw)
Aw=ra=r√
r^2 +h^2Step 6: Find the sum of the areasA
A=Ab+Aw
=r^2 +r√
r^2 +h^2=r(
r+√
r^2 +h^2)
Exercise 13 – 4:
1.Find the total surface area of the following objects (correct to 1 decimal place if necessary):
a)5 cm13 cm438 13.3. Right pyramids, right cones and spheres