Question

Please answer this question. ​

Answer 1

Answer:

they are complementary angles.

Step-by-step explanation:

according to the angle sum property of triangles,the sum of all interior angles of a triangle is equal to 180 degree.

$< e = {90}^{0}$

$< d + < f + < e = {180}^{0}$

$< d + < f + {90}^{0} = {180}^{0}$

Therefore,

$< d + < f = {180}^{0} - {90}^{0} = {90}^{0}$

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