By adding -(e)r to the positive degree, and by using the word 'more' before the positive degree:
Great, greater.
Black, blacker.
Close, closer,
White, whiter.
Grateful, more grateful.
Important, more important.
Don't forget to observe the normal grammatical rules, such as doubling the final consonant where necessary:
Hot, hotter.
Red, redder.
And changing 'y' into 'ie' where necessary:
Happy, happier.
Creamy, creamier.
And so forth ...
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Two lines that form a 90 degree angle are considered perpendicular.
Comparative is comparing between 2 things and is done by adding "more" in front of the word. The superlative is comparing 3+ things and is achieved by adding "most" in front of the word. The comparative form of ordinary would be "more ordinary" and the superlative would be "most ordinary".
A 90 degree angle and 2 acute angles will form a right angle triangle.
An expression of the second degree can be any kind of expression, the most popular being a quadratic polynomial of the form ax^2 + bx + c.
It can be 2/5 or in decimal form 0.4