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The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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An isosceles triangle is know to be a triangle that has 2 equal sides. Therefore an isosceles triangle has 2 equal sides.

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The parts of an isosceles triangle are labeled as follows: a vertex angle (usually displayed as the top most angle), the 2 sides that form the vertex angle are the two equal sides, and the 3rd side is known as the base, the other two angles are known as the base angles.

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An isosceles triangle has two equal sides, this creates a triangle that also has 2 equal angles, the equal angles are those that are directly across from the equal sides

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An equalateral triangle is known to be a triangle that has 3 equal sides.

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Just as with the isosceles triangle, having equal sides creates equal angles across from those sides. Because all the sides are equal all angles are equal also.

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A Triangle has 180 degrees total within it's angles. Therefore if an equilateral triangle has 3 equal angles, you can simply divide 180 by three to receive the answer. 180/3 = 60

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If a base angle is measured at 60 degrees, then the other base angle must be 60 degrees. Therefore you've used 120 (60+60) degrees out of the 180 that a triangle has. 180 - 120 = 60degrees remaining for the vertex angle.

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With 2 equal sides we already know that the triangle must be isosceles, Having an angle measure of 70 degrees does not matter.

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Because an equalateral triangle has 3 equal sides, if one of the sides measures 20 you know the others must measure as 20 also in order to be equal.

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Given that a base angle equals 45 degrees, we know that the other base angle must equal 45. 45+45 = 90. And we know that a triangle has 180 degrees in it. 180-90=90

'; rightans[0] = 1; rightans[1] = 1; rightans[2] = 1; rightans[3] = 1; rightans[4] = 1; rightans[5] = 1; rightans[6] = 1; rightans[7] = 1; rightans[8] = 1; rightans[9] = 1; //-->