Question

1) find the total surface area of a cone of slant height 20 cm and diameter of base is 28 CM

can you please show step by step​

Answer 1

Answer:

2,992 cm^2

Step-by-step explanation:

Here, Slant height=20 cm

Radius of the base =28/2=14 cm

Therefore, Total surface area of the cone

= 22/7 × 14 ( 14+20)

= 44 × 2 × 34

= 2,992 cm^2

Answer 2

Given,

Slant height = 20 cm

Diameter of base = 28cm

Radius = Diameter / 2

Radius = 28 / 2 = 14 cm

To find:

Total surface area of a cone

Area of total surface area of cone = Πr ( l + r)

= 22/7 × 14 ( 20+ 14)

= 44 ( 34)

= 1486 cm²

Hence total surface area of cone = 1486 cm²