Question

can we say if one angle of a parallelogram is 90° then it is a square or a rectangle?​

Answer 1

No, in square all Angles are 90 and in Rectangle 2 Angles are 90. So, we cannot say it is a Square or rectangle.

Answer 2

Answer:

yes

Step-by-step explanation:

it is because,

opposite angles in a parralelogram are equal so the other angle is also 90 degrees.

also sum of coresponding anles in a paralellogram is 180 degrees so 180- 90 = 90.

therefore the other two Angle so are also 90

Hence prove , all angles are 90 degrees ,

so the parallegram is a rectangle but not neccecarily a square as there is no information if the opposite sides are equal or not.

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