0
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)
Still curious? Ask our experts.
Chat with our AI personalities
Rafa
Rene
JordanAdd your answer:
Earn +20 pts
A triangle has an area of 144 sq inches and its base is 2 ft long What is the altitude of the triangle?
First convert the base to the same kind of units you have defined the area in (but linear); 24 inches. The area of a triangle is half of the base times the height .12 (half the base) times what is 144?12, the height (altitude) of the triangle is 12 inches (one foot).
What are the first 20 triangle numbers?
Calculate n*(n+1)/2 for n=1, 2, 3, ... , 20.
How can you tell if 3 sides of a triangle are acute or obtuse?
First you would square the length of each of the sides. You'd add the squares of the smaller two numbers. If they are smaller than the square of the biggest side, then the triangle is obtuse. If their sum is bigger, then the triangle is acute. If they are equal, then the triangle is a right triangle.Example:length of sides-23, 34, 49232+342__492529+1156__24011685
The area of a triangle is 6 square units Both the height and the length of the base are whole numbers What are the possible lengths and heights?
1&12, 2&6, 3&4!
What numbers can represent the side lengths of a right triangle?
Any three numbers, a, b, and c, which satisfy the equation a2 + b2 = c2 will form the sides of a right triangle. Some common values are 3, 4, 5 (and all multiples), 5, 12, 13 (and all multiples), and 7, 24, 25 (and all multiples).
