Tham KY's answer to XP's Secondary 2 Maths question.
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Date Posted:
6 years ago
Wait sorry, where does 3/32 comes from?
And the formula is 1/3(pi)(r)^2h right? "3/32(pi)(r)^2h" has extra variables.
But I can understand 3/32(1200) though, basically 1200=(r)^2h,and multiplying by 3/32 means reducing cone P radius and height simultaneously to meet cone Q's size.
And the formula is 1/3(pi)(r)^2h right? "3/32(pi)(r)^2h" has extra variables.
But I can understand 3/32(1200) though, basically 1200=(r)^2h,and multiplying by 3/32 means reducing cone P radius and height simultaneously to meet cone Q's size.
Constant put outside, 3/32 ( pi(r^2)h ),
Keep 3/32, sub pi(r^2)h from P, becomes
3/32 (1200)...
Keep 3/32, sub pi(r^2)h from P, becomes
3/32 (1200)...
3/32 comes from 1/3 * (3/4)^2 * 1/2
= 1/3 * 9/16 * 1/2 = 3/32
= 1/3 * 9/16 * 1/2 = 3/32
wow! I understood now! combining them together adds 1/3 and pi together from 3/32 with 1200. That's cool!
sorry, for (b), how is 1/8 derived?
(1/2)^3 = 1/8
Why cube root height? I thought height is in cm?
Question says cone Z is similar to cone P,
Using similar figure property,
Area ratio = (length ratio) ^2
Volume ratio = (length ratio) ^3
From similarity and congruence chapter.
Using similar figure property,
Area ratio = (length ratio) ^2
Volume ratio = (length ratio) ^3
From similarity and congruence chapter.
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