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Q:A:### Quick Answer

**An isosceles triangle could have rotational symmetry if it were also an equilateral triangle.** An isosceles triangle is a triangle with at least two equal sides. An equilateral triangle is a triangle with exactly three equal sides. By definition, all equilateral triangles are also isosceles triangles.

A shape or image with rotational symmetry is one that can be rotated by some degree amount and still appear the same. In the case of an equilateral triangle, the shape remains the same each time the triangle is rotated by 120 degrees. As a subset of isosceles triangles, equilateral triangles have rotational symmetry.

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## What is Pascal's triangle?

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Full Answer >**Pascal's triangle is a geometric arrangement of binomial coefficients in a triangle.**Its construction is related to the binomial coefficients by Pascal's rule. This intricate number pattern was named after Blaise Pascal, a French mathematician, although it was known about by the Chinese and studied for 500 years before Pascal.Filed Under: - Q:
## Does a rectangle have two or four lines of symmetry?

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Full Answer >**A rectangle has two lines of symmetry.**It can be folded horizontally and vertically, from the middle of the sides, but it cannot be folded corner to corner to achieve a line of symmetry.Filed Under: - Q:
## Why can't a triangle have more than one obtuse angle?

A:An obtuse angle is more than 90 degrees. The three angles within any triangle always equal exactly 180 degrees. If two angles are obtuse — even if they are both only 91 degrees — they add up to more than 180 degrees. Therefore, it is impossible for more than one angle in a triangle to be greater than 90 degrees.

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## What is Pascal's Triangle used for today?

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Full Answer >**Pascal's Triangle, named after French mathematician Blaise Pascal, is used in various algebraic processes, such as finding tetrahedral and triangular numbers, powers of two, exponents of 11, squares, Fibonacci sequences, combinations and polynomials.**The triangle was actually invented by the Indians and Chinese 350 years before Pascal's time.Filed Under: