Question

Radius of circural base of an ear of corn is 6.6cm and its length is 11.2cm.If an avg 1sqcm area contains 2 corn kernels,find the total number of kernels on a corn

Answer 1

Hello Mate!

Here is your solution!

Curved surface area of corn = πrl

Now, l = √( r² + h² )

= √( 6.6² + 11.2² )

= √( 43.56 + 125.44 )

= √169 = 13 cm

So, curved surface area = 22/7 × 6.6 × 13 cm²

= 269.7 cm²

Now, when 1 cm² covers = 2 kernels

Then 269.7 cm² will cover = 269.7 × 2 = 539.4 kernels

Hence, 539 kernels ( approx. ) will be in the corn.

Have great future ahead!

Answer 2

हल -

दिया है -

शंकु की ऊंचाई h = 11.2

त्रिज्या r = 6.6

अतः तिर्यक् ऊँचाई l = √(r² + h²)

$= \sqrt({6.6} {}^{2}+11.2 {}^{2})$


$\sqrt{169} = 13cm$


शंकु का वक्र पृष्ठ = πrl

$= \frac{22}{7} \times 6.6 \times 13$


$= 269.7 {cm}^{2}$


जब 1cm² = 2 kernels को ढक लेता है तो,

269.7cm² ढकेगा 539.4 kernels को