Lessons + CET Practice
175 worked lessons and every practice set, marked instantly.
₱499one payment
CET Math Review · Geometry
Circles: Circumference, Area, Arc and Sector
A circle of radius 10 with a 72 degree slice. Two formulas for the whole circle, then one fraction applied twice - arc from the circumference, sector from the area.
This lesson is part of a NEXUS plan.
Log in if you already have a plan, or pick one below. You pay once with any QR Ph app (GCash, Maya, your bank) and the whole library unlocks straight away.
Plans
Pick a plan, pay once by QR Ph
The diagnostic exam stays free. Everything else is one payment, no subscription.
All-Access Pass
Lessons, practice, the review pack PDFs and a seat in the current live review batch.
₱1,499one payment
Compare every plan, including the review pack and live classes »