Class 10 Mathematics | Surface Area of Cone

Mathematics, Class 10 · Unit 5

Surface Area of Cone

Slant height · CSA = πrl · TSA = πr(r + l)

By the end of this lesson you can

🍦

Recognise a cone and name its parts

📐

Use l² = h² + r²

✂️

Show where CSA = πrl comes from

🧮

Solve problems on CSA and TSA

Paper activity

From a sector to a cone

DRAW

Draw a circle with centre O

CUT

Cut out sector AOB

BEND

Bend it until OA meets OB

SEE

Arc AB becomes the base circumference

The notes are free to read in full.

Presenter notes: Today we learn to measure the surface of a shape we all know from ice cream: the cone.