[picture provided]
triangle jkl is an isosceles triangle with jk = kl, and mk = 26.

what is ml?
a. 26
b. 64
c. 77
d. 154

so an isosceles triangle has twin sides, stemming from a "vertex" and towards a "base".

JK and KL stem from vertex K and go towards base JL.

the angles that the twin sides make on the other side, the base, are also twins.

we know ∡K = 26°, since the sum of all interior angles in a triangle is 180°, then 180 - 26 = 154, the twin angles will split that remaining degrees, namely each one is 154/2 = 77°.

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step-by-step explanation: