Quadrilateral abcd is inscribed in circle o.
what is m∠c?

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show how to solve this question. again.

To solve this question we will have to make use of one of the properties of the inscribed quadrilateral. That property is: "Opposite angles in any quadrilateral inscribed in a circle are supplements of each other".

Thus, as we can see from the diagram given,

Thus, now that we know the value of x, we can easily find the value of the because we know that:

Thus, is the correct answer.

just sum

10 + 10 = 20

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a