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A circular table top has diameter 140 cm. Calculate the area of the table top in cm² , giving your answer as a multiple of π.

Area of a circle = π r²

r = (1/2) d = (1/2) * 140 = 70

area         = π * (70)²

                = 4900 π cm²

SM
Answered by Sulem M. Maths tutor
3032 Views

How do I effectively close-read a passage from a novel studied in the exam? - GCSE English Literature

Student should read the passage once over to try and place it within the context of the novel. Highlight key terms in the question, e.g. a question asking how Steinbeck presents the relationship between G...

AH
3939 Views

What is radioactivity?

Imagine a water ballon which is slowly filling up with water. The ballon is fine and intact when there's not much water in it but what happens when we fill it so much that it can no long hold all the wate...

EB
Answered by Eoin B. Physics tutor
2467 Views

Explain how CO2 can cross a cells plasma membrane

Normally we think of CO2 as a gas because it is (at least when its in the atmosphere it is). However, it is a very different story inside of cells. CO2 is produced as a result of respiration inside mitoch...

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Answered by Eoin B. Biology tutor
3242 Views

A function is defined parametrically as x = 4 sin(3t), y = 2 cos(3t). Find and simplify d^2 y/dx^2 in terms of t and y.

We first need to find dy/dx and we use the fact that dy/dx = dy/dt * dt/dx. So we have dy/dt = -6sin(3t) and dx/dt = 12cos(3t). Substituing these in we have dy/dx = -6*sin(3t)1/(12cos(3t...

BS
Answered by Barnaby S. Maths tutor
6149 Views

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