Question

find out the area of metal sheet needed to make a closed cylinder of radius 4.2 cm and height 6 CM also find out volume of the cylinder
​

Answer 1

Answer:

Mutel sheet = CSA of cylindrical + Base of cylindrical  

=2πrh+πr  

2

 

=  

7

2×22

​

×4.2×15+  

7

22

​

×4.2××4.2

=451.44m  

2

 

solution

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Step-by-step explanation:

Answer 2

Answer:

bhai please mark the brainlest dedo

Step-by-step explanation:

Given:ABCD is a quadrilateral and AC=BD and AD=BC

To prove: ABCD is trapezium

Proof: In ΔADB and ΔBCA

(1) AD=BC (Given)

(2) AC=BD (Given )

(3) AB=AB (Common side)

∴ ΔADB≅ΔBCA

∴ ∠A=∠B (Congruency property)

AC=BD (Given), AD=BC (Given)

Hence ABCD is an isosceles trapezium