Multiply ( pi R2 ) by [ (angle included in the sector) / 360 ].

possibly

The circumference is 12.566370614359172 feet.

90 degrees...

They are all examples of geometric shapes. A rectangle is two diminutional and pyramids and cubes are three diminutional.

8

It has (8820+360)/180 = 51 sides

Any triangle with a 90 degree angle is called a right triangle.

The answer is 9.499 m approx.

A linear foot is the same as a foot. So, an 18-foot diameter circle would measure 18 linear feet in diameter!

To find the volume of a triangular prism, find the area of one of the triangles (base of the prism) first (base x height divided by 2). When you have the area of the triangle, then multiply the area of the triangle by the height of the prism, *not the height of the base.

Yes, the sum of any two sides is always greater than the third side:

9 + 4 > 11

4 + 11 > 9

11 + 9 > 4

The external angle of a regular octagon is 225 degrees. Each internal angle of a regular octagon is 135 degrees.

A rhino is a large (1500kg-3500kg), grey, thick skinned (paciderm) mammal. It has a maximum height of around 1.7 metres and is around 4 metres long. The rhino's head is long and elongated with eyes at about mid-point between its nucal hump (neck muscle) and lips with relativaly large ears.On the front of the rhinos skull are two horns, the one in front is much larger than the second. This animal is found through out southern Africa and India. The rhino is an odd-toed ungulate with short stuby looking legs and can gain speeds of up to 35km an hour.

It is a clear liquid that comes from the tobbacco plant to keep bugs from eating it. (This post by babybluehashyo)

posteroanterior projection

The Vinculum, in some countries, is the name given to the horizontal line used to separate the numerator and denominator in a fraction.

If two lines have angles theta1 and theta2 relative to some third arbitrary line, then the angle between those two lines is theta1 minus theta2. The normal of a line at a point is a line that is 90 degrees from the line going through that point, so the angle between a line and its normal is 90 degrees. As a result, the angle between the two normals of those lines is (theta1 plus 90) minus (theta2 plus 90), which is the same as theta1 minus theta2 because the two plus 90's cancel each other.

Consider the isosceles trapezium ABCD (going clockwise from top left) with AB parallel to CD. And let the diagonals intersect at O

Since it is isosceles, AD = BC

and <ADC = <BCD (the angles at the base BC).

Now consider triangles ADC and BCD.

AD = BC

The side BC is common

and the included angles are equal.

So the two triangles are congruent.

and therefore <ACD = <BDC

Then, in triangle ODC,

<OCD (=<ACD = <BDC) = <ODC

ie ODC is an isosceles triangle.

The triangle formed at the other base can be proven similarly, or by the fact that, because AB CD and the diagonals act as transversals, you have equal alternate angles.

In PCl3 there are three bonds to the central atom (P) and one lone pair..

This can be worked out as follows. P has 5 valence electrons, shares three electrons with the chorine atoms (1 each) leaving 2 electrons on the P as a lone pair. In VSEPR theory this is an AX3E compound like ammonia.