Triangle ABC is simlar to Triangle DEF. AB divided by DE equals x. BC divided by EF also equals x. CA divided by FA also equals x. Note: It only works like this. When two similar or congruent triangles are named (eg Triangle ABC), the order of the capital letters is important.
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if any two angles are similar the triangle will be similar
An equilateral triangle is a triangle with three equal sides. An isosceles triangle is one with two equal sides. So yes, an equilateral triangle qualifies as being an isosceles triangle as well. This is quite similar to the relationship between squares and rectangles, where a square is always a rectangle, but a rectangle isn't necessarily a square.
decreases
A right angle triangle with 45, 45 and 90 degree angles is similar to an isosceles triangle
No.