Question

Find the area of a regular pentagon of each side
15 cm and the length of the perpendicular from its
centre to its side as 8 cm.​

Answer 1

Answer:

Mathematics (from Greek: μάθημα, máthēma, 'knowledge, study, learning') includes the study of such topics as quantity (number theory), structure (algebra), space (geometry), and change (mathematical analysis). It has no generally accepted definition.

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Answer 2

Answer:

Percentage of Copper = 82.5%

Total Parts of Alloy = 7+33 => 40

% of Zinc = \begin{gathered}\sf{\dfrac{7}{40}\times 100 = \dfrac{7}{2}\times5=17.5\%}\\\end{gathered}

40

7

×100=

2

7

×5=17.5%

% of Copper = \begin{gathered}\sf{\dfrac{33}{40}\times100=\dfrac{33}{2}\times5=82.5\%}\\\end{gathered}

40

33

×100=

2

33

×5=82.5%

Therefore, the total percent adds up to 100%.

So,

% of Zinc = 17.5%

% of Copper = 82.5%

Hope it helps u