How to find area and curcumfrence of a circle?

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

Which of the following transformations will always produce a congruent figure?