Identify congruent shapes by matching the first shape in each row with its identical counterpart.

Final Answer:
The congruent shapes are:
- Row 1: Triangle (left) matches triangle (middle-right), and rectangle (right) matches rectangle (middle-left).
- Row 2: Oval (left) matches oval (right); the two triangles in the middle are congruent.
- Row 3: Rectangle (left) matches rectangle (middle-left); square (middle-right) matches square (right).
- Row 4: Small triangle (left) matches small triangle (middle-left); large triangle (middle-right) matches large triangle (right); square (far right) matches square (middle).
- Row 5: Circle (left) matches circle (far right); small triangle (middle-left) matches small triangle (middle-right); oval (middle) has no match in that row — but wait, rechecking: actually, in row 5, left = circle, middle-left = small triangle, middle = oval, middle-right = small triangle, right = circle. So: circle ↔ circle, small triangle ↔ small triangle, oval is alone — but the instruction says “ring the shape that matches the first shape” in each row. So for each row, compare the *first* shape to others in that same row and ring the one(s) that are congruent to it.

Correct per-row matching (only ring the shape(s) congruent to the first shape in each row):

Row 1: First shape = triangle → ring the triangle in the middle (third position).
Row 2: First shape = oval → ring the oval on the far right.
Row 3: First shape = rectangle → ring the rectangle in the second position (middle-left).
Row 4: First shape = small triangle → ring the small triangle in the second position (middle-left).
Row 5: First shape = circle → ring the circle on the far right.

So the shapes to ring are:
- Row 1, third shape (triangle)
- Row 2, fourth shape (oval)
- Row 3, second shape (rectangle)
- Row 4, second shape (small triangle)
- Row 5, fifth shape (circle)

Since the question asks to “Ring the shape that matches the first shape” in each row, the final answer is the list of positions (row, column) or simply identify those five shapes.

But as a single concise final answer suitable for a worksheet:

Ring:
• the triangle in row 1, third column
• the oval in row 2, fourth column
• the rectangle in row 3, second column
• the small triangle in row 4, second column
• the circle in row 5, fifth column