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# What are the Triangle numbers up to 21?

# The legs of a right triangle are 21 and 28 inches long what is the are of the triangle?

The area is 294 square inches.

# What are the triangle numbers up to 50?

3,6,10,15,21,28,36,45,55

# What does an obtuse triangle add up to?

180 degrees, no matter what triangle it is, it always adds up to 180 degrees because it has 3 sides.

# Is a triangle with sides of lengths 20 21 and 29 a right triangle?

Yes. Using Pythagorean's theorem: 202+212 = 400+441 = 841 = 292 = 841

# What are the first 12 triangle numbers?

1 (1) 3 (1 + 2) 6 (1 + 2 + 3) 10 (1 + 2 + 3 + 4) 15 (1 + 2 + 3 + 4 + 5) 21 (1 + 2 + 3 + 4 + 5 + 6) 28 (1 + 2 + 3 + 4 + 5 + 6 + 7) 36 (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8) 45 (1 + 2 …+ 3 + 4 + 5 + 6 + 7 + 8 + 9) 55 (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10) 66 (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11) 78 (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12)

# What is the number for 21 zeros after a number?

a sextillion :) i feel clever knowing that

# When do 3 numbers not form a triangle?

3 numbers can't be the lengths of the sides of a triangle if . . . -- any one of them is less than the difference of the other two -- any one of them is more than the sum …of the other two (The above two statements are equivalent. Also, in both cases, a triangle is not formed if the any one of them is EQUAL to the difference or sum of the other two.)

# What is an isosceles triangle measure up to?

In all triangles, the angles always measure up 180 degrees. In an isosceles triangle two of the angles are equal.

# What do equilateral triangles add up to?

if you're referring to the sum of the interior angles, it's 180 degrees, as is with any kind of triangle.

# What makes up the Bermuda triangle?

Bermuda Island, Puerto Rico, and Miami

# Why do you have to be 21 to sign up for Marlboro?

Although the legal age to purchase cigarettes is 18, you can't receive cigarette coupons if you are under 21. Therefore, most tobacco companies will not allow you to to join.

# Number of right angles in a triangle?

0 or 1. A right triangle has one right angle. All other triangles have zero right angles.

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In Numbers

# What is a number which is a square number and triangle number?

36 = 62 = Triangle(8) The triangle number formula: T(n) = (n2+n)/2. Here is T(8) graphically: . 1 = T(1) = 1 .. +2 = T(2) = 3 ... +3 = T(3) = 6 .... +4 = 10 ....…. +5 = 15 ...... +6 = 21 ....... +7 = 28 ........ +8 = 36 36 = 62, graphically: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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# How many number of triangles in a pentagon?

3 triangles

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# Area of equilateral triangle with perimeter of 21 inches?

(6.06 x 3.5) = 21.20 sq in.

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# What two numbers add up to 21 and multiply to 90?

6 and 15