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Finding the RADIUS AND DIAMETER of a circle questions please?
Give all answers correct to 3 Significant figures where appropriate, except question 3.
1. While on special offer, a tin of baked beans contains 25% extra free. If the height of the tin is to remain the same and the area of the base of the original tin is 30cm^2 find the diameter of the new tin.
2. A running track consists of two straight sections with semi-circular ends. If the straight sections measure 100 metres and one complete lap on the inside of the track measures 0.5 km, what is the distance x between the two straights?
3. A rope 60m long and 5cm in diameter is coiled tightly. Estimate, correct to one significant figure, the radius of the 'circle' formed.
I am really STUCK on these questions HELP will be greatly appreciated THANKS!
3 Answers
- Zeta1Lv 61 decade agoFavorite Answer
2
The distance between the straight sections is the diameter of the semi-circular end.
(1) The entire length of the semi-circular ends is 2 * pi * r or pi * d since 2 * r = d
(2) One semi-circular end is pi * d / 2
(3) the entire track is 500m = 100m + 100m + d * pi / 2 + d * pi /2
300 = d * pi or d = 95.492
#3 is a tough one.
take a look at http://en.wikipedia.org/wiki/Clackson_scroll_formu...
- Anonymous4 years ago
you are going to be able to desire to be attentive to the definitions and measures of a circle. radius is the degree from the middle to the circumference. diameter is the degree from circumference to circumference interior the direction of the middle. (the diameter is often equivalent to 2 radii) The circumference is given by ability of the formula: C = 2 ? r you ought to have the means to calculate the radius (r) and the circumference (C) once you be attentive to the diameter.
- 1 decade ago
I know how you feel.I get stuck on some topics in maths.
Theres a certain formula to do them ones i think.
I cant remember it off the top of my head but it should be in your book somewhere.
Hope i helped some how :)
