1. STRATEGIC INTERVENTION MATERIALS
IN MATHEMATICS 10
Department of Education
Region III
Schools Division of Zambales
GUISGUIS NATIONAL HIGH SCHOOL
Guisguis, Sta. Cruz, Zambales
2. LEAST MASTERED SKILLS
Identifying the degree measure of an
Arcs of a Circle
Sub-Tasks:
โข Name and identify the central angle
of a circle.
โข Name and identify the minor arc
and the major arc of a circle.
โข Find the degree measure of a central
angles.
Guide
Card
3. Overview
.
Are you ready to learn more
about central angles ? Arcs
of a circle? Their
corresponding measures?
Lets go & do fun activities
to understand it!
5. Minor arc โ measure
less than 180 degrees.
- Named by using the
two endpoints of an
arc.
Major arc โ measures
greater than 180
degrees.
- Named by using the
two endpoints and
another point on the
arc.
Minor Arcs Major Arcs
1.
2.
3.
4.
5.
6.
7. DEGREE MEASURE OF AN ARC
1. The degree measure of a
minor arc is the measure of
the central angle which
intercepts the arc.
2. The degree measure of a
major arc is equal to 360
minus the measure of the
minor arc with the same
endpoints.
3. The degree measure of a
semicircle is 180ยฐ
45
30
8. Assessment
Card
In the activity you have just
done, were you able to find
the degree measure of the
central angles and arcs? Iโm
sure you did! Letโs try more
fun activities!
40 45
100
11. Can You
Now
โ Identify and name the central
angle of a circle.
โข Find the degree measure of a
central angles.
โข Identify and name the minor arc
and the major arc of a circle.
โข Identify the degree measures of an
arc?
15. Answer
Card # 4
Central
angles
Measure Intercepted
Arc
Measure
ADB 25ยฐ AB 25ยฐ
ADC 115ยฐ AC 115ยฐ
ADE 180ยฐ AE 180ยฐ
BDC 90ยฐ BC 90ยฐ
CDE 65ยฐ CE 65ยฐ
EDF 25ยฐ EF 25ยฐ
FDG 45ยฐ FG 45ยฐ
GDH 45ยฐ GH 45ยฐ
HDA 65ยฐ HA 65ยฐ
16. Reference
Card
- Mathematics Learners Module-Grade10 (DEPED)
p. 140 โ 141, 150 โ 151
- New High School Mathematics, Diwa Learning System,
Inc. p. 292 โ 326
- Next Century Mathematics , Mercado, Suzara & Orines
(3rd Year- Geometry), Phoenix Publishing House, Inc.
p. 121 โ 125
- http://www.goggle.com
17. My Score is
________
I did great and fully
understood the lesson
51 - 75
I did good and partially
understood the lesson. I
still need to review.
26 - 50
I need to go back with the
lesson because there are
still areas I need to work
on. I will not give up.
1-25
I