Answer :

**Concept Used:** Circumference of the base of the cone = 2πr

Curved Surface Area of cone = πrl

The volume of cone

Where r = radius of the cone, h = height of the cone, and l = slant height of the cone.

**Given:**

The slant height of the heap = 35 cm

The circumference of the base = 132 cm

**Explanation:**

Let us find the radius of the Heap first,

2πr = 132 cm

r

r

r = 21 cm

The amount of tarpaulin to cover the heap = Curved Surface Area of the cone = πrl

Now put the value of “r” and “l” we get,

The amount of tarpaulin to cover the heap

The amount of tarpaulin to cover the heap = 2310 cm^{2}

**Amount of food grains = Volume of food grains**

Amount of food grains

Now we need to calculate the height of the cone.

h =

h =

h = 28 cm

**Putting the value of “h” in the formula of volume of the cone we get,**

Amount of food grains

Amount of food grains = 12936 cm^{3}

Now half of the food grains are donated to the orphanage,

Amount of food grains donated

Amount of food grains = 6468 cm^{3}

**Hence, The amount of food grains donated are 6468 cm ^{3}.**

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