3 years ago

What is the total surface of the pyramid in square centimeters? A: 17.5 B:70 C:140 D:35

Mathematics

1 answer:

Airida [17]3 years ago

4 0

Answer:

C:140

Step-by-step explanation:

because 7 x 5 in the tiangle.

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Find the area of a kites with diagonals 6.5in and 10in.<br> I need work shown plz help!!!!!

mihalych1998 [28]

The area of a kite is:

A=(d1*d2)/2, where d1 and d2 are the two diagonals

In this case:

A=6.5*10/2

A=32.5 in^2

8 0

3 years ago

Simplify the expression.<br><br> <img src="https://tex.z-dn.net/?f=%5Cfrac%7B6%7D%7B1%2B%5Csqrt%7B3%7D%20%7D" id="TexFormula1" t

REY [17]

Answer:

Step-by-step explanation:

Rationalize the denominator by multiplying both denominator & numerator by the conjugate of the denominator.

Conjugate of the denominator 1 + √3 is 1 - √3

$\frac{6}{1+\sqrt{3}}=\frac{6(1-\sqrt{3})}{(1+\sqrt{3})(1-\sqrt{3})}\\\\=\frac{6(1-\sqrt{3})}{(1+\sqrt{3})(1-\sqrt{3})}\\\\=\frac{6(1-\sqrt{3})}{1^{2}-(\sqrt{3})^{2}}\\\\=\frac{6(1-\sqrt{3})}{1-3}\\\\=\frac{6(1-\sqrt{3})}{-2}\\\\=(-3)(1-\sqrt{3})\\\\=-3+3\sqrt{3}$