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1 (APEX)
A triangle is formed by three lines. If the ends of two lines meet to form a right-angle (90 degrees), the third line can only form angles less than 90 degrees.
90 + 45 + 45 = 180 the three angles must total 180 degrees.
Yep. All equilateral triangles are isosceles triangles.
False
7cm
The sum of two acute angles of a right triangle must equal 90 degrees.
No
False
The third side must be longer than 11 and shorter than 19.
The sum of the lengths of any two sides of a triangle is greater than the length of the third side.
Information about the lengths of two sides of a triangle is insufficient to determine its area.
Congruent - SSS
An EQUILATERAL triangle has all three sides the same length.
An ISOSCELES triangle has two sides with the same length.
A SCALENE triangle has all three sides different lengths.
119.7, couldn't figure that out yourself? 90 x .133 = 119.7
No, it is not.
It is true because a triangle with a right angle and two acute angles is a right angle triangle.
With a triangle the sum of its 2 smaller sides must be greater than its longest side and so if 7 and 9 are its smaller sides then its longest side could be 10
180 degrees minus interior angle = exterior angle and that the 3 exterior angles of a triangle add up to 360 degrees.
Only if the right triangle contains a 90 degree angle and 2 acute angles that add up to 90 degrees
No, it could not. A triangle cannot have a perimeter of length zero.
10
4 < x < 20
Yes and it would be in the form of an isosceles triangle
