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brilliants [131]
2 years ago
15

The formula for the area of the shaded region on the diagram is: Area of the circle - Area of the square The area of the circle

is 76.8 cm2 rounded to 1 decimal place. The area of the square is 12.7 cm2 truncated to 1 decimal place. Write the error interval for the area, a , of the shaded region in the form m < a < n .
Mathematics
1 answer:
erma4kov [3.2K]2 years ago
5 0

Answer:

AREA &. CIRCUMFERENCE OF. CIRCLES SOLUTIONS. Items included with question papers. Nil. Materials ... In each diagram the centre of the circle is marked with a cross (X). ... Circle and radius. Circle and chord. Circle and sector. Circle and diameter ... circle,. Give your answer, in centimetres, correct to 1 decimal place.

Step-by-step explanation:

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Answer:

A.

SA= \frac{2}{3} \pi rl+16 \pi r^2

Step-by-step explanation:

Surface area of the original cone

SA= \pi r l + \pi r^2... (1)

When, radius is quadrupled and slant height is reduced to one sixth

i. e. \: \:r = 4r\: \: \&\:\: l= \frac{1}{6}l

Plug the above values of r and l in equation (1), new surface area becomes:

SA= \pi (4r)\times \frac{1}{6} l+ \pi (4r)^2

SA= \frac{4}{6} \pi rl+16 \pi r^2

\huge \purple {\boxed {SA= \frac{2}{3} \pi rl+16 \pi r^2}}

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