Question

Find the radius of cone it height 7cm and slant height 25cm.
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Answer 1

See the attachment,

It is given that...

AB=7cm

AC=25

BC=r

Applying, Pythagoras theorem,

$\sf AC^2-AB^2=BC^2 \\\\\sf </p><p> 25^2-7^2=r^2 \\\\\sf </p><p>625-49=r^2 \\\\\sf </p><p>r^2=576 \\\\\sf </p><p>r= \sqrt{576} \\\\\sf </p><p>r=24</p><p>$