This page explains how to find the Monya Toma shrine and solve the "Drawing Parabolas" puzzle.
How to Reach the Shrine
After you activate Ridgeland Tower, go north on the road near the tower. This shrine is on a hill east of the road. It's visible from the Serenne Stable up the road.
How to Solve the Shrine
Look for the crystal switch on one of the platforms and shoot it twice. Then stand on the launcher near where you entered the room, then stand on the next launcher to reach the treasure chest. It contains a Thunderblade.
Then hit the crystal switch once to rotate the platform. Put a round bomb on the launcher on this platform. When the bomb is launched at the wooden crates beyond, detonate the bomb.
Then go back to the orange ball near the entrance and put it on the launcher. Then if the ball doesn't reach the target, launch yourself to that platform to pick up the ball and put it into the target hole. Or you can use a Korok Leaf to push the ball the rest of the way from a distance if you have one. After the bars open, you can go in and talk to Monya Toma.