How to Find an Angle with Inverse Trig on a TI-84

Opposite 7, hypotenuse 10. The angle is sin⁻¹(7/10). 2nd SIN is sin⁻¹.

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More Geometry guides.

How to Use the Pythagorean Theorem on a TI-84

Legs 5 and 12. Hypotenuse = √(5² + 12²). 2nd x² is √(.

How to Use the Distance Formula on a TI-84

From (1, 2) to (4, 6): √((4 − 1)² + (6 − 2)²).

How to Use π and Find the Area of a Circle on a TI-84

Radius 6. 2nd ^ is π. Leave the answer in the calculator instead of rounding π to 3.14.

How to Find Sector Area on a TI-84

A 60° sector of a circle with radius 5: (60/360)·π·5².

How to Use the Law of Cosines on a TI-84

Sides 7, 8, 9. The angle across from 9 is cos⁻¹((7² + 8² − 9²) ÷ (2·7·8)).

How to Use the Law of Sines on a TI-84

a / sin(40°) = 10 / sin(65°), so a = 10 sin(40°) ÷ sin(65°).

All TI-84 guides