Adjacent angles of a parallelogram are ___.
at right angle
In a parallelogram, since the opposite sides are parallel, sum of the interior adjacent angles is equal to 180∘.
Consider the following statements:
When two straight lines intersect:
(i) adjacent angles are complementary
(ii) adjacent angles are supplementary
(iii) opposite angles are equal
(iv) opposite angles are supplementary
ΔDEF in the given figure is a right-angled triangle with ∠E=90∘. What type of angles are ∠D and ∠F?
a) They are equal angles
b) They form a pair of adjacent angles
c) They are complementary angles
d) They are supplementary angles