Question

Find total surface area of a cone whose length of the radius of the base is 1.5cm and slant height is 2.5cm​

Answer 1

Solution

Given :-

• Radius of base = 1.5 cm
• Height of cone = 2.5 cm

Find :-

• Total surface area of cone

Explantion

Using Formula

$\boxed{\underline{\tt{\red{\:TSA_{cone}\:=\:(\pi\:rl\:+\:\pi\:r^2}}}}$

Where,

• π = 22/7 .
• r = Radius
• l = Length

Keep , all required values

==> Total surface area of cune = ( πr² + πrl)

==> Total surface area of cune = (22/7) × 1.5² + (22/7) × 1.5 × 2.5

==> Total surface area of cune = (22/7) × 2.25 + ( 22/7) × 3.75

==> Total surface area of cune = ( 22× 2.25 + 22×3.75)/7

==> Total surface area of cune = (49.5 + 82.5)/7

==> Total surface area of cune = 132.0/7

==> Total surface area of cune = 18.9 cm²

Hence

• Total surface area of cone will be = 18.9 cm²

______________________

Answer 2

Step-by-step explanation:

A≈18.85cm²

r Radius

1.5

cm

l Slant height