GEOMETRY FINAL EXAM

2014 DPSAMS. DEGAIN

3RD CARD MARKING

• CONGRUENT FIGURES• CONGRUENT TRIANGLES• PROPERTIES OF POLYGONS• PROPERTIES OF QUADRILATERALS

WHAT IS A CONGRUENT FIGURE?

• CORRESPONDING SIDES AND ANGLES ARE SAME MEASURE (CONGRUENT). • CORRESPONDING IS SIMILAR TO MATCHING SIDES AND ANGLES. • LOOK FOR TIC MARKS AND ANGLE ARCS,• LOOK FOR ACTUAL SIDE MEASUREMENTS AND ANGLE

MEASUREMENTS IF AVAILABLE.

CONGRUENT TRIANGLES• SSS: SIDE, SIDE, SIDE• IF THREE SIDES OF ONE TRIANGLE ARE

CONGRUENT TO THREE SIDES OF ANOTHER TRIANGLE THEN THE TWO TRIANGLES ARE CONGRUENT.

• SAS: SIDE, ANGLE, SIDE• IF TWO SIDES AND THE INCLUDED ANGLE OF

ONE TRIANGLE ARE CONGRUENT TO TWO SIDES AND THE INCLUDED ANGLE OF ANOTHER TRIANGLES THEN THE TRIANGLES ARE CONGRUENT.

CONGRUENCE IN TRIANGLES CONT.

ASA: ANGLE, SIDE, ANGLE• TWO ANGLES AND AN INCLUDED

SIDE ARE CONGRUENT IN TWO TRIANGLES.

AAS: ANGLE, ANGLE, SIDE• TWO ANGLES AND A NON-INCLUDED

SIDE ARE CONGRUENT IN TWO TRIANGLES.

COMMON TRIANGLESISOSCELES • SUM OF ANGLES 180• TWO SIDES CONGRUENT• TWO ANGLES ARE CONGRUENT• BASE ANGLES ARE THE SAME.

EQUILATERAL• SUM OF ANGLES 180• ALL ANGLES ARE 60 DEGREES

EACH. • EACH SIDE IS CONGRUENT.

RIGHT TRIANGLE CONGRUENCE• HYPOTENUSE-LEG THEOREM (HL)• IF THE HYPOTENUSE AND A LEG OF ONE RIGHT TRIANGLE ARE CONGRUENT TO

THE HYPOTENUSE AND LEG OF ANOTHER RIGHT TRIANGLE, THEN THE TRIANGLES ARE CONGRUENT.

POLYGON PROPERTIES• POLYGON ANGLE-SUM THEOREM

• POLYGON EXTERIOR ANGLE SUM-THEOREM

• INTERIOR ANGLE OF REGULAR POLYGON THEOREM

• CLASSIFYING POLYGONS• EQUILATERAL

• ALL SIDES CONGRUENT• EQUIANGULAR

• ALL ANGLES CONGRUENT• REGULAR

• ALL SIDES AND ANGLES ARE CONGRUENT.

POLYGON PREFIXES • TRI• QUAD• PENTA• HEXA• HEPTA• OCTA• NONA• DECA• DODECA• N

QUADRILATERAL PROPERTIES• 4 sides• Sum 360 • 4 angles

PARALLELOGRAMS• OPPOSITE SIDES ARE PARALLEL• OPPOSITE SIDES ARE CONGRUENT• OPPOSITE ANGLES ARE CONGRUENT• CONSECUTIVE ANGLES ARE SUPPLEMENTARY• DIAGONALS BISECT EACH OTHER

RECTANGLES• HAVE ALL THE PROPERTIES OF A PARALLELOGRAM• EACH ANGLE IS 90 DEGREES• DIAGONALS ARE EQUAL IN LENGTH

RHOMBI• ALL THE PROPERTIES OF PARALLELOGRAMS• FOUR CONGRUENT SIDES• DIAGONALS ARE PERPENDICULAR• DIAGONALS BISECT EACH OTHER• DIAGONALS BISECT EACH ANGLE

SQUARES

• HAVE ALL THE PROPERTIES OF A PARALLELOGRAM, RECTANGLE AND RHOMBUS COMBINED.

OTHER QUADRILATERALSTRAPEZOIDS• ONE PAIR OF PARALLEL SIDES• BASES• ISOSCELES HAVE CONGRUENT BASE

ANGLES (2 PAIR) AND 2 CONGRUENT SIDES

KITES• TWO PAIRS OF CONSECUTIVE SIDES

CONGRUENT • NO OPPOSITE SIDES CONGRUENT• DIAGONALS ARE PERPENDICULAR

SIMILARITY• CORRESPONDING ANGLES ARE CONGRUENT• CORRESPONDING SIDES ARE PROPORTIONAL• SCALE FACTOR = THE RATIO OF SIMILAR FIGURES• SIMILARITY STATEMENT SHOWS CONGRUENT ANGLES, AND PROPORTIONAL

SIDES (EXTENDED RATIO)• SIMILAR SYMBOL IS ~

RIGHT TRIANGLESPYTHAGOREAN THEOREM

• “A” IS A LEG• “B” IS A LEG• “C” IS THEY HYPOTENUSE (LONGEST

SIDE)

PYTHAGOREAN TRIPLES• WHOLE NUMBERS THAT SATISFY

THE PYTHAGOREAN THEOREM• EXAMPLES INCLUDE: 3,4,5 AND

6,8,10. • NO DECIMALS• NO FRACTIONS

SPECIAL RIGHT TRIANGLES45-45-90

• BOTH LEGS ARE THE SAME EXACT MEASURE. • IF GIVEN A HYPOTENUSE, USE THE

FOLLOWING EQUATION TO SOLVE FOR THE LEG:

30-60-90

• THERE ARE TWO WAYS TO FIND THE SHORT LEG IF IT IS MISSING:

• REMEMBER TO REDUCE ALL FRACTIONS.

TRIGONOMETRIC RATIOS

SINE𝑜𝑝𝑝𝑜𝑠𝑖𝑡𝑒h𝑦𝑝𝑜𝑡𝑒𝑛𝑢𝑠𝑒

COSINE𝑎𝑑𝑗𝑎𝑐𝑒𝑛𝑡h𝑦𝑝𝑜𝑡𝑒𝑛𝑢𝑠𝑒

TANGENT𝑜𝑝𝑝𝑜𝑠𝑖𝑡𝑒𝑎𝑑𝑗𝑎𝑐𝑒𝑛𝑡

AREA• PARALLELOGRAMS • SQUARES • RECTANGLES • TRIANGLES • CIRCLES R STANDS FOR RADIUS, AND A RADIUS ½ THE DIAMETER.

PERIMETER/CIRCUMFERENCE

• OF POLYGONS: SIMPLY ADD ALL THE SIDES!• OF CIRCLES: RADIUS IS THE “R”, DIAMETER IS THE “D”