Question

The diagram below shows scalene triangle JKL.

Triangle J K L. Side L K extends to point H to form exterior angle J K H.

Which is true about the diagram? Select two options.
Measure of angle J K H + measure of angle J K L = 180 degrees
Measure of angle J K L + measure of angle J L K + measure of angle K J L = 180 degrees
Measure of angle J K H = measure of angle J L K
Measure of angle J K L + measure of angle J L K = 90 degrees
Measure of angle K J L = measure of angle K L J

Answer 1

Options 1 and 2.

1 is true because ∠JKH and ∠JKL are a linear pair (supplementary).
2 is true because the interior angles of any triangle sum to 180°.

The others are false (3: an exterior angle equals the sum of the two remote interior angles, not just one; 4 and 5 are not guaranteed for a scalene triangle).