This question pls I don’t understand

Is the square root of 4 plus the square root of 16 rational?

The area of a circle is equal to 1 dm². find the radius of the circle.

Which is a logical conclusion based on the given information? a. figure abcd is a rhombus by the definition of a rhombus. b. segment ac is congruent to segment dc by cpctc. c. angle acb is congruent to angle adc by the angle-side-angle theorem. d. triangle acd is congruent to triangle cab by the hypotenuse-leg theorem.